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 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package javax.xml.bind.helpers;

import org.w3c.dom.Node;

import javax.xml.bind.ValidationEvent;
import javax.xml.bind.ValidationEventHandler;
import javax.xml.bind.ValidationEventLocator;
import java.net.URL;

/**
 * <p>
 * JAXB 1.0 only default validation event handler. This is the default
 * handler for all objects created from a JAXBContext that is managing
 * schema-derived code generated by a JAXB 1.0 binding compiler.
 *
 * <p>
 * This handler causes the unmarshal and validate operations to fail on the first
 * error or fatal error.
 *
 * <p>
 * This handler is not the default handler for JAXB mapped classes following
 * JAXB 2.0 or later versions. Default validation event handling has changed
 * and is specified in  {@link javax.xml.bind.Unmarshaller} and
 * {@link javax.xml.bind.Marshaller}.
 *
 * @author <ul><li>Ryan Shoemaker, Sun Microsystems, Inc.</li></ul>
 * @see javax.xml.bind.Unmarshaller
 * @see javax.xml.bind.Validator
 * @see javax.xml.bind.ValidationEventHandler
 * @since JAXB1.0
 */
public class DefaultValidationEventHandler implements ValidationEventHandler {

  public boolean handleEvent(ValidationEvent event) {

    if (event == null) {
      throw new IllegalArgumentException();
    }

    // calculate the severity prefix and return value
    String severity = null;
    boolean retVal = false;
    switch (event.getSeverity()) {
      case ValidationEvent.WARNING:
        severity = Messages.format(Messages.WARNING);
        retVal = true; // continue after warnings
        break;
      case ValidationEvent.ERROR:
        severity = Messages.format(Messages.ERROR);
        retVal = false; // terminate after errors
        break;
      case ValidationEvent.FATAL_ERROR:
        severity = Messages.format(Messages.FATAL_ERROR);
        retVal = false; // terminate after fatal errors
        break;
      default:
        assert false :
            Messages.format(Messages.UNRECOGNIZED_SEVERITY,
                event.getSeverity());
    }

    // calculate the location message
    String location = getLocation(event);

    System.out.println(
        Messages.format(Messages.SEVERITY_MESSAGE,
            severity,
            event.getMessage(),
            location));

    // fail on the first error or fatal error
    return retVal;
  }

  /**
   * Calculate a location message for the event
   */
  private String getLocation(ValidationEvent event) {
    StringBuffer msg = new StringBuffer();

    ValidationEventLocator locator = event.getLocator();

    if (locator != null) {

      URL url = locator.getURL();
      Object obj = locator.getObject();
      Node node = locator.getNode();
      int line = locator.getLineNumber();

      if (url != null || line != -1) {
        msg.append("line " + line);
        if (url != null) {
          msg.append(" of " + url);
        }
      } else if (obj != null) {
        msg.append(" obj: " + obj.toString());
      } else if (node != null) {
        msg.append(" node: " + node.toString());
      }
    } else {
      msg.append(Messages.format(Messages.LOCATION_UNAVAILABLE));
    }

    return msg.toString();
  }
}
